Abstract
A 72-year-old female visited our hospital, because an abdominal mass was pointed out by medical examination. The mass was palpable at the right upper abdomen, which was movable and as large as an infant's head. On diagnostic imaging methods, the surrounding organs were found to be compressed by the tumor. Abdominal angiography revealed the feeding artery and faint hypervascularity of the tumor. Mesenteric tumor was suspected and laparotomy was performed. The tumor was connected with only the lesser omentum and developed in the bursa omentalis, being excised easily. Other abdominal organs were normal and there were neither lymph node swelling nor peritoneal dissemination. The excised tumor was 17×12×11 cm in size, and 1110 g in weight. Histologically, it was diagnosed as leiomyosarcoma. The postoperative course was uneventful and the patient is alive and well without any recurrence at present. Primary leiomyosarcomas of the lesser omentum are rare and only 13 cases have been reported in Japan. Further discussion is made by reviewing the literature.
